CN109748470A - A kind of method of microbiological treatment excess sludge - Google Patents
A kind of method of microbiological treatment excess sludge Download PDFInfo
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- CN109748470A CN109748470A CN201711060659.6A CN201711060659A CN109748470A CN 109748470 A CN109748470 A CN 109748470A CN 201711060659 A CN201711060659 A CN 201711060659A CN 109748470 A CN109748470 A CN 109748470A
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- sludge
- excess sludge
- microbiological treatment
- pyrohydrolysis
- microorganism reactor
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Abstract
The present invention relates to the minimizing process field of excess sludge, specially a kind of method of microbiological treatment excess sludge espespecially utilizes ultrasound+pyrohydrolysis+treatment based on immobilized microorganisms excess sludge method.This method is realized the fully dispersed of sludge by the cavitation of ultrasonic wave and is tentatively cracked, the precipitation of sludge cracked with endogenous substance is then further realized by pyrohydrolysis, sludge disintegration liquid after cracking is added to immobilized microorganism reactor, it absorbed, decomposed by immobilized microorganism, the organic matter protein matter in oxidation removal sludge disintegration liquid, water outlet can achieve national emission standard.The features such as amount of excess sludge can be effectively reduced in this method, will not cause secondary pollution, and immobilized microorganism reactor has COD processing load high, strong shock resistance, sludge yield is few, the suitable sludge disintegration liquid handled after cracking.
Description
Technical field
The present invention relates to the minimizing process field of excess sludge, specially a kind of side of microbiological treatment excess sludge
Method espespecially utilizes ultrasound+pyrohydrolysis+treatment based on immobilized microorganisms excess sludge method.
Background technique
Organic matter, the content of nitrogen and phosphorous are very high in excess sludge, containing a large amount of pathogenic microorganism, through dewatered remaining dirty
Mud has stink, and water body and soil can be entered with rainwater etc. by dealing with improperly, causes secondary pollution.The processing cost of excess sludge accounts for dirt
30% or so of water factory's overall running cost brings no small financial burden to the operation of sewage plant, can to excess sludge into
The economical and effective hot topic for being treated as educational circles's research of row.
The polysaccharide that ultrasonic wave can be destroyed effectively outside sludge cell wall is conducive to sludge to destroy its flocculation structure
It is evenly dispersed.The a series of physical chemical action generated by ultrasonic cavitation effect, destroys sludge eucaryotic cell structure, discharges intracellular
Organic substance accelerates the hydrolysis of sludge.Ultrasonication sludge will not generate secondary pollution and additional chemical substance, and equipment
Simply, the problems such as easy to spread, but higher there are energy consumption, limits it and further applies.
Pyrohydrolysis is a kind of technology using heat breaking sludge, by being heated to sludge, allow sludge at a certain temperature
Hydrolysis, is conducive to sludge cell dissolution, the substances such as polysaccharide intracellular, protein and organic matter is discharged, as mud decrement
Pretreatment, is used widely.Pyrohydrolysis simple process, cost of investment are low, but that there are hydrolysis times is long, crack low efficiency etc. and ask
Topic.
Patent " a kind of oil-containing water sludge reduction processing system " (application number 201620783908.9) discloses one kind and contains
Grease sludge reduction processing system, including sludge-tank, sludge dewatering equipment, screw conveyor, sewage pump etc., the processing system energy
The moisture content and volume of oil-containing sewage sludge are enough effectively reduced, to reduce the expense and burden of oil-containing sewage sludge subsequent processing.
Patent " method that pyrohydrolysis joint high temperature anaerobic acidification improves acidogenesis of waste activated sludge amount " (application number 201611190063.3) is adopted
Dirt is effectively improved by sludge after the processing of high temperature and pressure pyrohydrolysis with high temperature and pressure pyrohydrolysis and high temperature anaerobic acidification technique
The release dissolution of protein, organic matter in mud provides solvent borne organic matter abundant for the subsequent progress of sludge is high temperature acidified, can
It effectively improves excess sludge hydrolysis efficiency and realizes the maximization of small molecular organic acid yield." low-frequency ultrasonic waves pretreatment is dirty
It is in the experimental study of mud " (Liu Heqing, Environmental Pollution and Control, 2012,34 (11): 5-8,24) the result shows that, low frequency ultrasound
Wave pre-processes dispersible sludge wadding body, dissolves out organic matter in sludge largely, improves the anaerobic digestion performance of sludge.Extend ultrasound
Wave action time increases the release that acoustic density each contributes to the substances such as organic matter in sludge, nitrogen, phosphorus." the heat of excess sludge
Hydrolysis experiment " (Wang Zhijun, China Environmental Science, 2005,25:56-60) has studied pyrohydrolysis pretreatment to excess sludge property
Influence, the results showed that with the increase of pyrohydrolysis temperature and time, the dissolution rate of sewage sludge solid increases, and intracellular organic matter can fill
It analyzes.
Excess sludge conventional treatment method is to fill after dehydration, but that there are dehydration efficiencies is low, needs to add medicament and cost
The problems such as high, landfill also want periodic detection landfill yard later, prevent sludge infiltration leakage etc. from causing secondary pollution.
The present invention improves the treatment effect of subsequent pyrohydrolysis by ultrasonic pretreatment sludge, the sludge mixing after cracking
Liquid, it can be achieved that qualified discharge, while reducing sludge quantity after treatment based on immobilized microorganisms, and " ozone treatment excess sludge subtracts
Quantization experimental study " (He Chuyin, environmental project journal, 2012,6 (11): 4228-4234) is compared, and the present invention has technique letter
It is single, it works well, without adding medicament, the features such as not generating secondary pollution.
Summary of the invention
Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a kind of microbiological treatment excess sludges
Then method is utilized the further breaking sludge of pyrohydrolysis, is realized sufficiently cracking for sludge using ultrasonic pretreatment sludge, break
Sludge after solution is added to aerobic digestion in immobilized microorganism reactor, realizes the minimizing processing of sludge.
To achieve the above objectives, the technical solution adopted by the present invention is that:
A kind of method of microbiological treatment excess sludge, specifically comprises the following steps:
Step 1: ultrasonic pretreatment is carried out to excess sludge；
Step 2: pretreated sludge is heat-treated；
Step 3: the mud mixed liquid after heat treatment being added in immobilized microorganism reactor and carries out aerobic digestion, is exposed
Water outlet after gas digestion process reaches the first discharge standard in " integrated wastewater discharge standard ".
Based on the above technical solution, excess sludge described in step 1 is sludge after sedimentation, sludge concentration 10g/L.
Based on the above technical solution, the time of ultrasonic pretreatment described in step 1 is 10-30min, ultrasonic wave
Intensity is 0.2-0.5W/mL.
Based on the above technical solution, the temperature of heat treatment described in step 2 is 70-80 DEG C, time 8-16h.
Based on the above technical solution, the heat treatment is that pyrohydrolysis is handled.
Based on the above technical solution, filler has been added in immobilized microorganism reactor described in step 3.
Based on the above technical solution, the filler added in immobilized microorganism reactor described in step 3 is to change
Property polyurethane, add volume ratio be 40%, after starting sludge concentration be 7-8g/L.
Based on the above technical solution, aeration control dissolved oxygen is dense in immobilized microorganism reactor described in step 3
Degree is 3-4mg/L, hydraulic detention time 30-40h.
The features of the present invention and beneficial effect are:
1) sludge is pre-processed using ultrasonic wave, the flocculation structure of sludge can be crushed, be conducive to sludge dispersion, increase
The specific surface area for adding sludge is conducive to subsequent pyrohydrolysis treatment effeciency；
2) mud mixed liquid after being cracked using fixation of microbe reactor for treatment, COD handle load and impact resistance
Mud mixed liquid can be effectively treated in height, and immobilized microorganism reactor has the characteristics that sludge yield is low, it is possible to reduce dirty
The yield of mud.
Detailed description of the invention
The present invention has following attached drawing:
Fig. 1 is process flow chart of the invention
Specific embodiment
Present invention will be described in further detail below with reference to the accompanying drawings.
As shown in Figure 1, a kind of method of microbiological treatment excess sludge of the present invention, includes the following steps:
Step 1: ultrasonic pretreatment is carried out to excess sludge；
Step 2: pretreated sludge is heat-treated；
Step 3: the mud mixed liquid after heat treatment being added in immobilized microorganism reactor and carries out aerobic digestion, is exposed
Water outlet after gas digestion process reaches the first discharge standard in " integrated wastewater discharge standard ".
Based on the above technical solution, excess sludge described in step 1 is sludge after sedimentation, sludge concentration 10g/L.
Based on the above technical solution, ultrasonic pretreatment time described in step 1 is 10-30min, and ultrasonic wave is strong
Degree is 0.2-0.5W/mL.
Based on the above technical solution, the temperature of heat treatment described in step 2 is 70-80 DEG C, time 8-16h.
Based on the above technical solution, the heat treatment is that pyrohydrolysis is handled.
Based on the above technical solution, filler has been added in immobilized microorganism reactor described in step 3.
Based on the above technical solution, the filler added in immobilized microorganism reactor described in step 3 is to change
Property polyurethane, add volume ratio be 40%, sludge concentration is about 7-8g/L after starting.
Based on the above technical solution, aeration control dissolved oxygen is dense in immobilized microorganism reactor described in step 3
Degree is 3-4mg/L, hydraulic detention time 30-40h.
The present invention carries out dispersion to sludge using ultrasonic pretreatment and tentatively cracks, then further using pyrohydrolysis
It cracks, the intracellular organic matter of sludge is precipitated, substantially increase the disintegration effect of sludge, the mud mixed liquid after cracking is added to fixation
Aerobic digestion is carried out in microorganism reactor, to realize the purpose of mud decrement.This method does not add medicine during processing
Agent and chemicals will not cause secondary pollution, and the sludge after cracking is added to immobilized microorganism reactor, the reactor energy
Higher COD load is born, with strong shock resistance, the advantages such as sludge yield is few.This method simple process, small investment, side
Just it operates, has wide practical use in the processing of city excess sludge and chemical industry plant excess sludge.
Specific embodiment is as follows.
Embodiment 1
Step 1: the excess sludge that concentration is 10g/L being taken to carry out ultrasonic pretreatment, ultrasonic 20min, ultrasonic intensity
0.3W/mL；
Step 2: the pretreated sludge of ultrasound is heated and carries out pyrohydrolysis, 70 DEG C of hydrolysis temperature, time 10h；
Treated mud mixed liquid COD is 4356mg/L, is added in immobilized microorganism reactor and is exposed
Gas digestion, adds polyurethane filler in reactor, and adding volume ratio is 40%, sludge concentration 7g/L, oxyty 3mg/L,
Hydraulic detention time 30h, water outlet COD are 51mg/L, reach " integrated wastewater discharge standard " (GB 8978-1996) first grade discharging
Standard, mud decrement is 70% after measured.
Embodiment 2
Step 1: the excess sludge that concentration is 10g/L being taken to carry out ultrasonic pretreatment, ultrasonic 10min, ultrasonic intensity
0.5W/mL；
Step 2: the pretreated sludge of ultrasound is heated and carries out pyrohydrolysis, 75 DEG C of hydrolysis temperature, time 16h；
Treated mud mixed liquid COD is 5687mg/L, is added in immobilized microorganism reactor and is exposed
Gas digests, and adds polyurethane filler in reactor, and adding volume ratio is 40%, sludge concentration 8g/L, oxyty 3.5mg/
L, hydraulic detention time 40h, water outlet COD are 57mg/L, reach " integrated wastewater discharge standard " (GB 8978-1996) level-one row
Standard is put, mud decrement is 72% after measured.
Embodiment 3
Step 1: the excess sludge that concentration is 10g/L being taken to carry out ultrasonic pretreatment, ultrasonic 30min, ultrasonic intensity
0.2W/mL；
Step 2: the pretreated sludge of ultrasound is heated and carries out pyrohydrolysis, 80 DEG C of hydrolysis temperature, time 8h；
Treated mud mixed liquid COD is 4785mg/L, is added in immobilized microorganism reactor and is exposed
Gas digests, and adds polyurethane filler in reactor, and adding volume ratio is 40%, sludge concentration 7.5g/L, oxyty 4mg/
L, hydraulic detention time 35h, water outlet COD are 54mg/L, reach " integrated wastewater discharge standard " (GB 8978-1996) level-one row
Standard is put, mud decrement is 75% after measured.
Embodiment 4
Step 1: the excess sludge that concentration is 10g/L being taken to carry out ultrasonic pretreatment, ultrasonic 18min, ultrasonic intensity
0.4W/mL；
Step 2: the pretreated sludge of ultrasound is heated and carries out pyrohydrolysis, 73 DEG C of hydrolysis temperature, time 12h；
Treated mud mixed liquid COD is 4532mg/L, is added in immobilized microorganism reactor and is exposed
Gas digests, and adds polyurethane filler in reactor, and adding volume ratio is 40%, sludge concentration 7.3g/L, and oxyty is
3.8mg/L, hydraulic detention time 33h, water outlet COD are 55mg/L, reach " integrated wastewater discharge standard " (GB 8978-1996)
First discharge standard, mud decrement is 74% after measured.
Comparative example 1
Step 1: the excess sludge that concentration is 10g/L being taken to carry out ultrasonication, ultrasonic 20min, ultrasonic intensity 0.3W/
mL；
Treated mud mixed liquid COD is 578mg/L, is added in immobilized microorganism reactor and is aerated
It digests, adds polyurethane filler in reactor, adding volume ratio is 40%, sludge concentration 7g/L, oxyty 3mg/L, water
Power residence time 30h, water outlet COD are 47mg/L, reach " integrated wastewater discharge standard " (GB 8978-1996) first grade discharging mark
Standard, mud decrement is 34% after measured.
Comparative example 2
Step 1: it takes excess sludge to heat and carries out pyrohydrolysis, 70 DEG C of hydrolysis temperature, time 10h；
Treated mud mixed liquid COD is 1357mg/L, is added in immobilized microorganism reactor and is exposed
Gas digestion, adds polyurethane filler in reactor, and adding volume ratio is 40%, sludge concentration 7g/L, oxyty 3mg/L,
Hydraulic detention time 30h, water outlet COD are 51mg/L, reach " integrated wastewater discharge standard " (GB 8978-1996) first grade discharging
Standard, mud decrement is 39% after measured.
The foregoing is merely preferable possible embodiments of the invention, not thereby limit to the scope of the patents of the invention, therefore all
It is the equivalence changes done with description of the invention and accompanying drawing content, is both contained in protection scope of the present invention.
The content not being described in detail in this specification belongs to the prior art well known to professional and technical personnel in the field.
Claims (8)
1. a kind of method of microbiological treatment excess sludge, which comprises the steps of:
Step 1: ultrasonic pretreatment is carried out to excess sludge；
Step 2: pretreated sludge is heat-treated；
Step 3: the mud mixed liquid after heat treatment being added in immobilized microorganism reactor and carries out aerobic digestion, aeration disappears
Changing treated, water outlet reaches first discharge standard in " integrated wastewater discharge standard ".
2. the method for microbiological treatment excess sludge as described in claim 1, it is characterised in that: residue described in step 1 is dirty
Mud is sludge after sedimentation, sludge concentration 10g/L.
3. the method for microbiological treatment excess sludge as described in claim 1, it is characterised in that: ultrasonic wave described in step 1
The pretreated time is 10-30min, ultrasonic intensity 0.2-0.5W/mL.
4. the method for microbiological treatment excess sludge as described in claim 1, it is characterised in that: be heat-treated described in step 2
Temperature be 70-80 DEG C, time 8-16h.
5. the method for microbiological treatment excess sludge as claimed in claim 4, it is characterised in that: the heat treatment is pyrohydrolysis
Processing.
6. the method for microbiological treatment excess sludge as described in claim 1, it is characterised in that: immobilization described in step 3
Filler has been added in microorganism reactor.
7. the method for microbiological treatment excess sludge as claimed in claim 6, it is characterised in that: immobilization described in step 3
The filler added in microorganism reactor is modified polyurethane, and adding volume ratio is 40%, and sludge concentration is 7-8g/L after starting.
8. the method for microbiological treatment excess sludge as described in claim 1, it is characterised in that: immobilization described in step 3
Aeration control oxyty is 3-4mg/L, hydraulic detention time 30-40h in microorganism reactor.
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Cited By (3)
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| CN112807601A (en) * | 2020-12-29 | 2021-05-18 | 吉林农业大学 | Organic pollutant environment-friendly pyrolysis treatment method |
| CN114772883A (en) * | 2022-05-16 | 2022-07-22 | 中国矿业大学 | Treatment method of black and odorous water body bottom mud and application of black and odorous water body bottom mud in preparation of baking-free bricks |
| CN115072962A (en) * | 2022-06-30 | 2022-09-20 | 东方电气集团东方电机有限公司 | Sludge dewatering method based on ultrasound and hydrothermal carbonization |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112807601A (en) * | 2020-12-29 | 2021-05-18 | 吉林农业大学 | Organic pollutant environment-friendly pyrolysis treatment method |
| CN114772883A (en) * | 2022-05-16 | 2022-07-22 | 中国矿业大学 | Treatment method of black and odorous water body bottom mud and application of black and odorous water body bottom mud in preparation of baking-free bricks |
| CN114772883B (en) * | 2022-05-16 | 2023-09-05 | 中国矿业大学 | Treatment method of black and odorous water body substrate sludge and application of black and odorous water body substrate sludge in preparation of baking-free bricks |
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